CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenues	$ 188,757	$ 89,300	$ 371,367	$ 333,077
Cost of revenues (exclusive of items shown below)	145,789	80,037	292,012	261,981
Selling, general and administrative expenses	29,403	28,775	59,998	65,305
Impairment and other charges	0	1,639	0	207,175
Depreciation and amortization	17,896	19,573	35,669	58,866
Gain on disposition of assets, net	(3,111)	(3,194)	(4,571)	(4,013)
Operating loss	(1,220)	(37,530)	(11,741)	(256,237)
Interest expense	(103)	(71)	(483)	(184)
Interest income	14	68	32	402
Other income (expense), net	616	(1,481)	1,123	(1,789)
Loss before income taxes	(693)	(39,014)	(11,069)	(257,808)
Income tax provision (benefit)	33	(13,921)	(681)	(72,292)
Net loss	$ (726)	$ (25,093)	$ (10,388)	$ (185,516)
Loss per share
Basic (in dollars per share)		$ (0.12)	$ (0.05)	$ (0.87)
Diluted (in dollars per share)		$ (0.12)	$ (0.05)	$ (0.87)